DEVELOPMENT OF AN EDUCATIONAL TENSILE TESTING MACHINE FOR TESTING THE MECHANICAL PROPERTIES OF POLYMER MATERIALS

U ovom završnom radu izrađena je edukacijska kidalica za ispitivanje polimernih materijala. Kidalica će nadalje biti korištena za ispitivanje mehaničkih svojstava polimernih materijala pri izradi završnih radova te laboratorijskih vježbi na Sveučilišnom odjelu za stručne studije Sveučilišta u Splitu, te je uvjet bio da bude rastavljiva i prenosiva. U radu su opisane vrste pogonskih sklopova koji se koriste kod kidalica te je izvršen je proračun za odabrani vijčani pogonski sklop. Kidalica će omogućiti ispitivanje vlačne čvrstoće za ispitne epruvete prema normi ISO 527-2. Kidalica je konstruirana u programu Autodesk Inventor te su izvedene simulacije analize naprezanja i deformacije. Također je konstruiran i elektroormar. Izrađeni su radionički nacrti s odgovarajućim sastavnicama te električne sheme. Prilikom izrade kidalice, komponente su podvrgnute strojnoj obradi odvajanjem čestica (tokarenje, glodanje, bušenje) te obradi bez odvajanja čestica odnosno spajanje komponenti postupkom zavarivanja. Nakon strojne obrade uslijedilo je pjeskarenje, nanošenje temeljnog i završnog premaza. Kidalica je zatim sastavljena te je izrađen elektroormar prema elektro shemi koji je montiran na kidalicu i spojen konektorima. Sve korištene komponente opisane su u ovom radu. Softver kidalice će biti dovršen naknadno na Odjelu za stručne studije nakon čega slijedi puštanje u rad.In this final paper, an educational tensile testing machine for testing polymeric materials was made. It will further be used to test the mechanical properties of polymeric materials in the preparation of final papers and laboratory exercises at the University Department of Professional Studies, University of Split, and the condition was that it be detachable and portable. The paper describes the types of drive assemblies used in tensile testing machines and the calculation for the selected screw drive assembly is performed. The machine will allow the tensile strength test for test tubes according to ISO 527-2. It was constructed in the Autodesk Inventor program so stress and strain analysis simulations were performed. An electrical cabinet was also constructed. Workshop plans were made along with component list and electrical scheme. When making the machine, the components are subjected to machining by particle separation (turning, milling, drilling) and machining without particle separation, that is joining the components by welding. Machining was followed by sandblasting, application of a primer and a top coat. The machine was then assembled and an electrical cabinet was made according to the electrical diagram which was mounted on the machine and connected with connectors. All components used are described in this paper. The software for tensile testing machine will be completed subsequently at the Department of Professional Studies followed by commissioning